Shift register unit, driving circuit, display device and driving method

ABSTRACT

A shift register unit, a driving circuit, a display device, and a driving method are disclosed. The shift register unit includes a first input circuit, a second input circuit, an output circuit, a first control circuit, and a second control circuit. The first input circuit is electrically connected to a first node, and is configured to transmit an input signal to the first node; the second input circuit is electrically connected to the first node and a second node, and is configured to control a level of the second node; the first control circuit is electrically connected to the second node and a third node, and is configured to control a level of the third node; and the output circuit is electrically connected to the third node and an output terminal, and is configured to output an output signal to the output terminal.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is the Continuation Application of U.S. patentapplication Ser. No. 16/642,140 filed on Feb. 26, 2020 which is theNational Stage of PCT/CN2019/079171 filed on Mar. 22, 2019, thedisclosure of which is incorporated by reference.

Embodiments of the present disclosure relate to a shift register unit, adriving circuit, a display device, and a driving method.

TECHNICAL FIELD Background

In the field of display technology, in order to improve the quality ofthe display image and the user experience, the realization of high PPI(Pixels Per Inch) and narrow bezel has gradually become a researchdirection. In recent years, with the continuous improvement of themanufacturing process of amorphous silicon thin film transistors oroxide thin film transistors, a driving circuit can be directlyintegrated on an array substrate of the thin film transistor to form aGOA (Gate driver On Array) to drive the display panel. The GOAtechnology helps to realize the narrow bezel design of the display paneland can reduce the production cost of the display panel.

SUMMARY

At least an embodiment of the present disclosure provides a shiftregister unit, comprising a first input circuit, a second input circuit,an output circuit, a first control circuit, and a second controlcircuit. The first input circuit is electrically connected to a firstnode, and is configured to transmit an input signal to the first nodeunder control of a first clock signal; the second input circuit iselectrically connected to the first node and a second node, and isconfigured to control a level of the second node under control of alevel of the first node or the first clock signal; the first controlcircuit is electrically connected to the second node and a third node,and is configured to control a level of the third node under control ofthe level of the second node and a second clock signal; the outputcircuit is electrically connected to the third node and an outputterminal, and is configured to output an output signal to the outputterminal under control of the level of the third node; and the secondcontrol circuit is electrically connected to the first node and thethird node, and is configured to control the level of the third nodeunder control of the level of the first node.

For example, the shift register unit provided by an embodiment of thepresent disclosure further comprises an output reset circuit, the outputreset circuit is electrically connected to the first node and the outputterminal, and is configured to reset the output terminal under controlof the level of the first node.

For example, the shift register unit provided by an embodiment of thepresent disclosure further comprises a third control circuit, the thirdcontrol circuit is electrically connected to the first node, and isconfigured to adjust, by coupling, the level of the first node undercontrol of the level of the first node.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the first input circuit comprises a firsttransistor, a gate electrode of the first transistor is configured toreceive the first clock signal, a first electrode of the firsttransistor is configured to receive the input signal, and a secondelectrode of the first transistor is electrically connected to the firstnode.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the second input circuit comprises a secondtransistor and a third transistor, a gate electrode of the secondtransistor is electrically connected to the first node, a firstelectrode of the second transistor is configured to receive the firstclock signal, and a second electrode of the second transistor iselectrically connected to the second node; and a gate electrode of thethird transistor is configured to receive the first clock signal, afirst electrode of the third transistor is configured to receive a firstlow voltage, and a second electrode of the third transistor iselectrically connected to the second node.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the first control circuit comprises a fourthtransistor, a fifth transistor, and a first capacitor; a gate electrodeof the fourth transistor is electrically connected to the second node, afirst electrode of the fourth transistor is configured to receive thesecond clock signal, and a second electrode of the fourth transistor iselectrically connected to a fourth node; a gate electrode of the fifthtransistor is configured to receive the second clock signal, a firstelectrode of the fifth transistor is electrically connected to thefourth node, a second electrode of the fifth transistor is electricallyconnected to the third node; and a first electrode of the firstcapacitor is electrically connected to the second node, and a secondelectrode of the first capacitor is electrically connected to the fourthnode.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the second control circuit comprises a sixthtransistor, a gate electrode of the sixth transistor is electricallyconnected to the first node, a first electrode of the sixth transistoris configured to receive a first high voltage, and a second electrode ofthe sixth transistor is electrically connected to the third node.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the output circuit comprises a seventh transistorand a second capacitor, a gate electrode of the seventh transistor iselectrically connected to the third node, a first electrode of theseventh transistor is configured to receive a second high voltage, and asecond electrode of the seventh transistor is electrically connected tothe output terminal; and a first electrode of the second capacitor iselectrically connected to the third node, and a second electrode of thesecond capacitor is electrically connected to the first electrode of theseventh transistor.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the output reset circuit comprises an eighthtransistor, a gate electrode of the eighth transistor is electricallyconnected to the first node, a first electrode of the eighth transistoris configured to receive a second low voltage, and a second electrode ofthe eighth transistor is electrically connected to the output terminal.

For example, in the shift register unit provided by an embodiment of thepresent disclosure, the third control circuit comprises a ninthtransistor and a third capacitor, a gate electrode of the ninthtransistor is electrically connected to the first node, a firstelectrode of the ninth transistor is configured to receive the secondclock signal, a second electrode of the ninth transistor is electricallyconnected to a first electrode of the third capacitor, and a secondelectrode of the third capacitor is electrically connected to the firstnode.

At least an embodiment of the present disclosure further provides adriving circuit, comprising a plurality of cascaded shift register unitseach of which is provided by any one of the embodiments of the presentdisclosure, except a first-stage of the shift register units, any one ofthe shift register units of other stages is connected with the outputterminal of a shift register unit of a preceding stage before the anyone of the shift register units of other stages.

For example, the driving circuit provided by an embodiment of thepresent disclosure further comprises a first clock signal line and asecond clock signal line, a (2n−1)th-stage of the shift register unitsis electrically connected to the first clock signal line to receive thefirst clock signal, and the (2n−1)th-stage of the shift register unitsis electrically connected to the second clock signal line to receive thesecond clock signal; a (2n)th-stage of the shift register units iselectrically connected to the second clock signal line to receive thefirst clock signal, and the (2n)th-stage of the shift register units iselectrically connected to the first clock signal line to receive thesecond clock signal; and n is an integer greater than zero.

At least an embodiment of the present disclosure further provides adisplay device, comprising the driving circuit provided by any one ofthe embodiments of the present disclosure.

For example, the display device provided by an embodiment of the presentdisclosure further comprises a plurality of pixel units arranged in anarray, each of the plurality of pixel units comprises a pixel circuit,the pixel circuit comprises a data writing sub-circuit, a drivingsub-circuit, and a light-emitting control sub-circuit; an outputterminal of an (n)th-stage of the shift register units in the drivingcircuit is electrically connected to a control terminal of thelight-emitting control sub-circuit of the pixel circuit in an (n)th rowof the pixel units; and n is an integer greater than zero.

At least an embodiment of the present disclosure further provides adriving method of the shift register unit, comprising a preliminarystage, a pull-up stage, a high-potential maintenance stage, a pull-downstage, and a low-potential maintenance stage, in the preliminary stage,causing the second clock signal to be changed from a low level to a highlevel, causing the input signal to be changed from a low level to a highlevel, and causing the level of the first node to be pulled up; in thepull-up stage, causing the second clock signal to be changed from a highlevel to a low level, causing the level of the third node to be pulleddown, and causing a level of the output signal to be pulled up; in thehigh-potential maintenance stage, causing the second clock signal to bechanged from a low level to a high level, causing the level of the firstnode to be maintained at a high level, causing the level of the outputsignal to be maintained at a high level, and adjusting a pulse width ofthe output signal by adjusting a pulse width of the input signal; in thepull-down stage, causing the first clock signal to be changed from ahigh level to a low level, causing the level of the first node to bepulled down, causing the level of the third node to be pulled up, andcausing the level of the output signal to be pulled down; and in thelow-potential maintenance stage, causing the level of the first node tobe maintained at a low level, causing the level of the third node to bemaintained at a high level, and causing the level of the output signalto be maintained at a low level.

For example, in the driving method provided by an embodiment of thepresent disclosure, adjusting the pulse width of the output signal byadjusting the pulse width of the input signal comprises: in a case wherethe pulse width of the output signal needs to be increased, causing thehigh level of the input signal to be maintained to a time point, in anext period of the first clock signal, when the first clock signal is ata high level, thereby causing the pulse width of the output signal to bedelayed by one period of the first clock signal.

For example, in the driving method provided by an embodiment of thepresent disclosure, a duty cycle of the first clock signal and a dutycycle of the second clock signal are both greater than 50%.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to clearly illustrate the technical solution of the embodimentsof the present disclosure, the drawings of the embodiments will bebriefly described in the following. It is obvious that the describeddrawings in the following are only related to some embodiments of thepresent disclosure and thus are not limitative of the presentdisclosure.

FIG. 1 is a schematic circuit diagram of a pixel circuit;

FIG. 2 is a signal timing diagram corresponding to the operation of thepixel circuit as shown in FIG. 1 ;

FIG. 3 is a schematic block diagram of a shift register unit provided bysome embodiments of the present disclosure;

FIG. 4 is a schematic block diagram of another shift register unitprovided by some embodiments of the present disclosure;

FIG. 5 is a schematic block diagram of still another shift register unitprovided by some embodiments of the present disclosure;

FIG. 6 is a schematic circuit diagram of an implementation example ofthe shift register unit as shown in FIG. 3 ;

FIG. 7 is a schematic circuit diagram of an implementation example ofthe shift register unit as shown in FIG. 4 ;

FIG. 8 is a schematic circuit diagram of an implementation example ofthe shift register unit as shown in FIG. 5 ;

FIG. 9 is a schematic circuit diagram of a shift register unit providedby some embodiments of the present disclosure;

FIG. 10 is a signal timing diagram corresponding to the operation of thepixel circuit as shown in FIG. 8 ;

FIG. 11 is a schematic diagram of a driving circuit provided by someembodiments of the present disclosure; and

FIG. 12 is a schematic block diagram of a display device provided bysome embodiments of the present disclosure.

DETAILED DESCRIPTION

In order to make objects, technical details and advantages of theembodiments of the disclosure apparent, the technical solutions of theembodiments will be described in a clearly and fully understandable wayin connection with the drawings related to the embodiments of thedisclosure. Apparently, the described embodiments are just a part butnot all of the embodiments of the disclosure. Based on the describedembodiments herein, those skilled in the art can obtain otherembodiment(s), without any inventive work, which should be within thescope of the disclosure.

Unless otherwise defined, all the technical and scientific terms usedherein have the same meanings as commonly understood by one of ordinaryskill in the art to which the present disclosure belongs. The terms“first,” “second,” etc., which are used in the description and theclaims of the present application for disclosure, are not intended toindicate any sequence, amount or importance, but distinguish variouscomponents. Also, the terms such as “a,” “an,” etc., are not intended tolimit the amount, but indicate the existence of at least one. The terms“comprise,” “comprising,” “include,” “including,” etc., are intended tospecify that the elements or the objects stated before these termsencompass the elements or the objects and equivalents thereof listedafter these terms, but do not preclude the other elements or objects.The phrases “connect”, “connected”, “coupled”, etc., are not intended todefine a physical connection or mechanical connection, but may includean electrical connection, directly or indirectly.

In the display panel technology, in order to achieve low cost and narrowbezel, a GOA (Gate driver On Array) technology can be adopted, that is,a driving circuit is integrated on a display panel through a thin filmtransistor manufacturing process, thereby realizing the advantages ofnarrow bezel and cost reduction.

FIG. 1 is a schematic circuit diagram of a pixel circuit for a displaydevice, the display device includes a plurality of pixel units arrangedin an array, and each of the plurality of pixel units includes a pixelcircuit as shown in FIG. 1 . As shown in FIG. 1 , the pixel circuitincludes a data writing sub-circuit 11, a driving sub-circuit 12, alight-emitting control sub-circuit 13, a switching sub-circuit 14, aninitialization sub-circuit 16, a light-emitting element EL, and acompensation sub-circuit 15.

For example, the data writing sub-circuit 11 is configured to write adata signal VDATAm to the driving sub-circuit 12 in response to a firstscanning signal SN[n]. The driving sub-circuit 12 is configured tocontrol a driving current that drives the light-emitting element EL toemit light. The light-emitting control sub-circuit 13 is configured totransmit the driving current provided by the driving sub-circuit 12 tothe light-emitting element EL in response to a light-emitting controlsignal EMI[n]. The light-emitting element EL is configured to emit thelight of a corresponding intensity in response to the driving current.The compensation sub-circuit 15 is configured to store the data signalwritten by the data writing sub-circuit 11 and compensate the drivingsub-circuit 12 in response to the first scanning signal SN[n]. Theswitching sub-circuit 14 is configured to provide a first power supplyvoltage VDD to the driving sub-circuit 12 in response to thelight-emitting control signal EMI[n]. The initialization sub-circuit 16is configured to initialize the driving sub-circuit 12 and thecompensation sub-circuit 15 in response to a second scanning signalSN[n−1].

For example, a gate line that provides the first scanning signal SN[n]may be electrically connected to the data writing sub-circuit 11 and thecompensation sub-circuit 15 of the pixel circuit of an (n)th row ofpixel units. A gate line that provides the second scanning signalSN[n−1] may be electrically connected to the data writing sub-circuit 11and the compensation sub-circuit 15 of the pixel circuit of an (n−1)throw of pixel units, and may further be electrically connected to theinitialization sub-circuit 16 of the pixel circuit of the (n)th row ofpixel units.

As shown in FIG. 1 , the data writing sub-circuit 11 may be implementedas a data writing transistor M11; the driving sub-circuit 12 may beimplemented as a driving transistor M12; the light-emitting controlsub-circuit 13 may be implemented as a light-emitting control transistorM13; the compensation sub-circuit 15 may be implemented as acompensation transistor M15 and a storage capacitor C11; the switchingsub-circuit 14 may be implemented as a switching transistor M14; and theinitialization sub-circuit 16 may be implemented as an initializationtransistor M16. It should be noted that all transistors as shown in FIG.1 are P-type transistors.

The working principle of the pixel circuit 10 as shown in FIG. 1 will bedescribed below with reference to a timing diagram of control signals asshown in FIG. 2 . For example, the working principle of the pixelcircuit 10 includes the following stages.

In an initialization stage 1, the second scanning signal SN[n−1] is at alow level, and the first scanning signal SN[n] and the light-emittingcontrol signal EMI[n] are at high levels. For example, the data writingtransistor M11 and the compensation transistor M15 are turned off by thehigh level of the first scanning signal SN[n], the light-emittingcontrol transistor M13 and the switching transistor M14 are turned offby the high level of the light-emitting control signal EMI[n], and theinitialization transistor M16 is turned on by the low level of thesecond scanning signal SN[n−1], so a control node CN is electricallyconnected to an initial voltage terminal Vinit to receive an initialvoltage. Therefore, during the initialization stage, the data signalstored in the storage capacitor C11 and a voltage of a gate electrode ofthe driving transistor M12 can be initialized.

In a programming stage 2, the second scanning signal SN[n−1] is at ahigh level, the first scanning signal SN[n] is at a low level, and thelight-emitting control signal EMI[n] is at a high level. For example,the initialization transistor M16 is turned off by the high level of thesecond scanning signal SN[n−1], the light-emitting control transistorM13 and the switching transistor M14 are turned off by the high level ofthe light-emitting control signal EMI[n], and the data writingtransistors M11 and the compensation transistor M15 are turned on by thelow level of the first scanning signal SN[n], so the data signal VDATAmcharges the gate electrode of the driving transistor M12 through thedata writing transistor M11, the driving transistor M12, and thecompensation transistor M15. According to the characteristics of thedriving transistor M12, when the voltage of the gate electrode of thedriving transistor M12 is charged to VDATAm-Vth (Vth is the thresholdvoltage of the driving transistor M12), the driving transistor M12 isturned off and the charging process ends.

In a light-emitting stage 3, the second scanning signal SN[n−1] and thefirst scanning signal SN[n] are at high levels, and the light-emittingcontrol signal EMI[n] is at a low level. The initialization transistorM16 is turned off by the high level of the first scanning signalSN[n−1], the data writing transistor M11 and the compensation transistorM15 are turned off by the high level of the first scanning signal SN[n],and the light-emitting control transistor M13 and the switchingtransistor M14 are turned on by the low level of the light-emittingcontrol signal EMI[n]. At this time, the driving current that generatedin response to the voltage signal VDATAm-Vth applied to the gateelectrode of the driving transistor M12 is supplied to thelight-emitting element EL through the driving transistor M12, therebycausing the light-emitting element EL to emit light.

For example, an OLED display panel is provided with a plurality of pixelunits arranged in an array, and each of the plurality of pixel units isprovided with a pixel circuit, for example, the pixel circuit may adoptthe pixel circuit as shown in FIG. 1 . In order to drive the OLEDdisplay panel to perform a display operation, not only a gate drivingcircuit for providing the scanning signal (for example, the firstscanning signal or the second scanning signal), but also alight-emitting control circuit for providing the light-emitting controlsignal EMI[n] is required. For example, similar to the gate drivingcircuit, the light-emitting control circuit can also be integrated onthe display panel using the GOA technology. For example, thelight-emitting control circuit may include a plurality of cascaded shiftregister units, and the plurality of shift register units are inone-to-one electrical connection with rows of pixel units in the displaypanel. For example, an output signal of an (n)th stage of the shiftregister units may be provided as a light-emitting control signal to the(n)th row of pixel units for controlling pixel circuits in the (n)th rowof pixel units to emit light. For example, the light-emitting brightnessof the pixel unit can be controlled by controlling the time during whichthe light-emitting control signal is at an active level.

In order to achieve a high PPI and a narrow bezel, it is necessary toreduce the area occupied by the light-emitting control circuit on thedisplay panel, so it is necessary to simplify the circuit structure ofthe light-emitting control circuit (that is, the shift register unit).

At least one embodiment of the present disclosure provides a shiftregister unit including a first input circuit, a second input circuit,an output circuit, a first control circuit, and a second controlcircuit. The first input circuit is electrically connected to a firstnode, and is configured to transmit an input signal to the first nodeunder the control of a first clock signal. The second input circuit iselectrically connected to the first node and a second node, and isconfigured to control a level of the second node under the control of alevel of the first node or the first clock signal. The first controlcircuit is electrically connected to the second node and a third node,and is configured to control a level of the third node under the controlof the level of the second node and a second clock signal. The outputcircuit is electrically connected to the third node and an outputterminal, and is configured to output an output signal to the outputterminal under the control of the level of the third node. The secondcontrol circuit is electrically connected to the first node and thethird node, and is configured to control the level of the third nodeunder the control of the level of the first node.

At least some embodiments of the present disclosure further provide adriving circuit, a display device, and a driving method corresponding tothe above-mentioned shift register unit.

The shift register unit, the driving circuit, the display device, andthe driving method provided by some embodiments of the presentdisclosure can simplify the circuit structure, thereby achieving anarrow bezel and reducing costs. In addition, a pulse width of an outputsignal of the shift register unit provided by some embodiments can beadjusted.

The embodiments of the present disclosure and examples thereof will bedescribed in detail below with reference to the drawings.

Some embodiments of the present disclosure provide a shift register unit100, as shown in FIG. 3 , the shift register unit 100 includes a firstinput circuit 110, a second input circuit 120, an output circuit 130, afirst control circuit 140, and a second control circuit 150. A pluralityof the shift register units 100 may be cascaded to form a drivingcircuit for driving a display device, such as an OLED display panel.

The first input circuit 110 is electrically connected to a first nodeN1, and is configured to transmit an input signal IN to the first nodeN1 under the control of a first clock signal CK1. For example, the firstinput circuit 110 is configured to receive the first clock signal CK1and the input signal IN, so when the first input circuit 110 is turnedon under the control of the first clock signal CK1, the input signal INthat is received is transmitted to the first node N1. For example, inthe case where a plurality of the shift register units 100 are cascadedto form a driving circuit, the present-stage of the shift register unitsmay receive an output signal of another stage of the shift registerunits and use the output signal as the input signal IN of thepresent-stage.

The second input circuit 120 is electrically connected to the first nodeN1 and a second node N2, and is configured to control a level of thesecond node N2 under the control of a level of the first node N1 or thefirst clock signal CK1. For example, the second input circuit 120 isconfigured to receive the first clock signal CK1, when the second inputcircuit 120 is turned on under the control of the level of first nodeN1, the first clock signal CK1 is transmitted to the second node N2,thereby controlling the level of the second node N2. For anotherexample, the second input circuit 120 is further configured to receive afirst low voltage VGL1, when the second input circuit 120 is turned onunder the control of the first clock signal CK1, the second node N2 iselectrically connected to the first low voltage VGL1, therebycontrolling the level of the second node N2.

It should be noted that, for example, the first low voltage VGL1 may bea DC low level, which is the same in the following embodiments and willnot be described again.

The first control circuit 140 is electrically connected to the secondnode N2 and a third node N3, and is configured to control a level of thethird node N3 under the control of the level of the second node N2 and asecond clock signal CK2. For example, the first control circuit 140 isconfigured to receive the second clock signal CK2, when the firstcontrol circuit 140 is turned on under the control of the level of thesecond node N2 and the second clock signal CK2, the second clock signalCK2 is transmitted to the third node N3, thereby controlling the levelof the third node N3.

The output circuit 130 is electrically connected to the third node N3and an output terminal OUT, and is configured to output an output signalto the output terminal OUT under the control of the level of the thirdnode N3. For example, the output circuit 130 is configured to receive asecond high voltage VGH2. When the output circuit 130 is turned on underthe control of the level of the third node N3, the second high voltageVGH2 is output to the output terminal OUT as the output signal.

It should be noted that, for example, the second high voltage VGH2 maybe a DC high level, which is the same in the following embodiments andwill not be described again.

The second control circuit 150 is electrically connected to the firstnode N1 and the third node N3, and is configured to control the level ofthe third node N3 under the control of the level of the first node N1.For example, the second control circuit 150 is configured to receive afirst high voltage VGH1, and when the second control circuit 150 isturned on under the control of the level of the first node N1, the firsthigh voltage VGH1 is transmitted to the third node N3, therebycontrolling the level of the third node N3.

It should be noted that, for example, the first high voltage VGH1 may bea DC high level, which is the same in the following embodiments and willnot be described again.

The output signal of the shift register unit provided by someembodiments of the present disclosure may be provided as alight-emitting control signal to a pixel unit of a display device forcontrolling a pixel circuit in the pixel unit to emit light. Forexample, further, the shift register unit provided by some embodimentsof the present disclosure can further adjust the pulse width of theoutput signal by adjusting the input signal IN, so as to control thelight-emitting brightness of the pixel unit. How to adjust the pulsewidth of the output signal will be described below, and will not berepeated here.

As shown in FIG. 3 , the shift register unit 100 provided by someembodiments of the present disclosure further includes an output resetcircuit 160. The output reset circuit 160 is electrically connected tothe first node N1 and the output terminal OUT, and is configured toreset the output terminal OUT under the control of the level of thefirst node N1. For example, the output reset circuit 160 is configuredto receive a second low voltage VGL2. When the output reset circuit 160is turned on under the control of the level of the first node N1, thesecond low voltage VGL2 is transmitted to the output terminal OUT, thatis, the low-level second low voltage VGL2 can pull down a level of theoutput terminal OUT, thereby implementing a reset operation on theoutput terminal OUT.

It should be noted that, for example, the second low voltage VGL2 may bea DC low level, which is the same in the following embodiments and willnot be described again.

As shown in FIG. 4 , the shift register unit 100 provided by someembodiments of the present disclosure further includes a third controlcircuit 170. The third control circuit 170 is electrically connected tothe first node N1, and is configured to adjust, by coupling, the levelof the first node N1 under the control of the level of the first nodeN1. For example, the third control circuit 170 is configured to receivethe second clock signal CK2. For example, the third control circuit 170may include a capacitor. When the second clock signal CK2 changes, thechange value of a level of the second clock signal CK2 adjusts, bycoupling, the level of the first node N1 through the capacitor. Forexample, when the second clock signal CK2 changes from a high level to alow level, the third control circuit 170 can pull down, by coupling, thelevel of the first node N1, so the level of the first node N1 becomeslower, thereby causing the output reset circuit 160 to achieve a betterreset operation on the output terminal OUT under the control of thelevel of the first node N1.

In the shift register unit provided by some embodiments of the presentdisclosure, by providing the third control circuit 170, the level of thefirst node N1 can be pulled down, by coupling, to improve a drivingreset capability of the output reset circuit 160, so the output terminalOUT can output a low level without a threshold loss when it is notnecessary to output a high level, thereby improving the contrast of thedisplay panel, and improving the display effect of the display panel.

It should be noted that, in some embodiments of the present disclosure,the first low voltage VGL1 and the second low voltage VGL2 each are a DClow level, for example, the level values of the first low voltage VGL1and the second low voltage VGL2 may be the same or different. The firsthigh voltage VGH1 and the second high voltage VGH2 are both a DC highlevel, for example, the level values of the first high voltage VGH1 andthe second high voltage VGH2 may be the same or different.

For example, as shown in FIG. 5 , in the shift register unit 100provided by some embodiments of the present disclosure, the second inputcircuit 120 and the output reset circuit 160 are configured to receive asame first voltage VGL, for example, the first voltage VGL is a DC lowlevel. The output circuit 130 and the second control circuit 150 areconfigured to receive a same second voltage VGH, for example, the secondvoltage VGH is a DC high level. It should be noted that, for the sameparts in FIG. 5 and FIG. 4 , reference may be made to the correspondingdescriptions in the foregoing embodiments, and details are not describedherein again.

In some embodiments of the present disclosure, the shift register unit100 as shown in FIG. 3 may be implemented as the circuit structure asshown in FIG. 6 . It should be noted that the transistors as shown inFIG. 6 are all described by taking P-type transistors as an example, anactive level of a P-type transistor is a low level, and an inactivelevel of the P-type transistor is a high level.

It should be noted that the “active level” in the embodiments of thepresent disclosure refers to the level that is capable of turning on atransistor that is operated, and the corresponding “inactive level”refers to the level that is not capable of turning on the transistorthat is operated (that is, the transistor is turned off). For example,in some embodiments of the present disclosure, in the case where thetransistor is a P-type transistor, the active level is a low level, theinactive level is a high level, and the inactive level is higher thanthe active level. In the case where the transistor is an N-typetransistor, the active level is high level, the inactive level is a lowlevel, and the inactive level is lower than the active level.

In addition, it should be noted that in the embodiments of the presentdisclosure, the high level and the low level are described relative toeach other. The high level represents a relatively higher voltage range(for example, the high level may adopt 5V, 10V, or other appropriatevoltage), and multiple high levels may be same or different. Similarly,the low level represents a lower voltage range (for example, the lowlevel may adopt 0V, −5V, −10V, or other appropriate voltage), andmultiple low levels can be same or different. For example, the minimumvalue of the high level is greater than the maximum value of the lowlevel.

As shown in FIG. 6 , the first input circuit 110 is implemented as afirst transistor T1. A gate electrode of the first transistor T1 isconfigured to receive the first clock signal CK1, a first electrode ofthe first transistor T1 is configured to receive the input signal IN,and a second electrode of the first transistor T1 is electricallyconnected to the first node N1. For example, when the first clock signalCK1 is at a low level, the first transistor T1 is turned on, so theinput signal IN is transmitted to the first node N1.

As shown in FIG. 6 , the second input circuit 120 is implemented toinclude a second transistor T2 and a third transistor T3. A gateelectrode of the second transistor T2 is electrically connected to thefirst node N1, a first electrode of the second transistor T2 isconfigured to receive the first clock signal CK1, and a second electrodeof the second transistor T2 is electrically connected to the second nodeN2. For example, when the first node N1 is at a low level, the secondtransistor T2 is turned on, so the first clock signal CK1 is transmittedto the second node N2.

A gate electrode of the third transistor T3 is configured to receive thefirst clock signal CK1, a first electrode of the third transistor T3 isconfigured to receive the first low voltage VGL1, and a second electrodeof the third transistor T3 is electrically connected to the second nodeN2. For example, when the first clock signal CK1 is at a low level, thethird transistor T3 is turned on, so the second node N2 is electricallyconnected to the first low voltage VGL1, thereby pulling down the levelof the second node N2. The level of the second node N2 can be controlledby a combined action of the second transistor T2 and the thirdtransistor T3, thereby controlling the first control circuit 140.

As shown in FIG. 6 , the first control circuit 140 is implemented toinclude a fourth transistor T4, a fifth transistor T5, and a firstcapacitor C1.

A gate electrode of the fourth transistor T4 is electrically connectedto the second node N2, a first electrode of the fourth transistor T4 isconfigured to receive the second clock signal CK2, and a secondelectrode of the fourth transistor T4 is electrically connected to afourth node N4. A gate electrode of the fifth transistor T5 isconfigured to receive the second clock signal CK2, a first electrode ofthe fifth transistor T5 is electrically connected to the fourth node N4,and a second electrode of the fifth transistor T5 is electricallyconnected to the third node N3. A first electrode of the first capacitorC1 is electrically connected to the second node N2, and a secondelectrode of the first capacitor C1 is electrically connected to thefourth node N4.

For example, when the level of the second node is at a low level and thesecond clock signal CK2 is at a low level, the fourth transistor T4 andthe fifth transistor T5 are turned on, so the second clock signal CK2 istransmitted to the third node N3, thereby implementing the control tothe level of the third node N3. In the shift register unit 100 providedin the embodiment of the present disclosure, the first capacitor C1 isused to store the level of the second node N2.

As shown in FIG. 6 , the second control circuit 150 is implemented as asixth transistor T6. A gate electrode of the sixth transistor T6 iselectrically connected to the first node N1, a first electrode of thesixth transistor T6 is configured to receive the first high voltageVGH1, and a second electrode of the sixth transistor T6 is electricallyconnected to the third node N3. For example, when the level of the firstnode N1 is at a low level, the sixth transistor T6 is turned on, so thefirst high voltage VGH1 with a high level is transmitted to the thirdnode N3, thereby pulling up the level of third node N3.

As shown in FIG. 6 , the output circuit 130 is implemented to include aseventh transistor T7 and a second capacitor C2. A gate electrode of theseventh transistor T7 is electrically connected to the third node N3, afirst electrode of the seventh transistor T7 is configured to receivethe second high voltage VGH2, and a second electrode of the seventhtransistor T7 is electrically connected to the output terminal OUT. Afirst electrode of the second capacitor C2 is electrically connected tothe third node N3, and a second electrode of the second capacitor C2 iselectrically connected to the first electrode of the seventh transistorT7, that is, the second electrode of the second capacitor C2 isconfigured to receive the second high voltage VGH2.

For example, when the level of the third node N3 is at a low level, theseventh transistor T7 is turned on, so the seventh transistor T7 outputsthe second high voltage VGH2 to the output terminal OUT as the outputsignal. For example, the output signal may be provided to a pixelcircuit in a pixel unit as a light-emitting control signal forcontrolling, for example, a light-emitting control transistor in thepixel circuit. In the shift register unit 100 provided in the embodimentof the present disclosure, the second capacitor C2 is used to store thelevel of the third node N3.

As shown in FIG. 6 , the output reset circuit 160 is implemented as aneighth transistor T8. A gate electrode of the eighth transistor T8 iselectrically connected to the first node N1, a first electrode of theeighth transistor T8 is configured to receive the second low voltageVGL2, and a second electrode of the eighth transistor T8 is electricallyconnected to the output terminal OUT. For example, when the level of thefirst node N1 is at a low level, the eighth transistor T8 is turned on,so the second low voltage VGL2 with a low level pulls down the level ofthe output terminal OUT, thereby implementing a reset operation on theoutput terminal OUT.

In some embodiments of the present disclosure, the shift register unit100 as shown in FIG. 4 may be implemented as the circuit structure asshown in FIG. 7 . It should be noted that the transistors as shown inFIG. 7 are all described by taking P-type transistors as an example, anactive level of a P-type transistor is a low level, and an inactivelevel of the P-type transistor is a high level.

As shown in FIG. 7 , the third control circuit 170 is implemented toinclude a ninth transistor T9 and a third capacitor C3. A gate electrodeof the ninth transistor T9 is electrically connected to the first nodeN1, a first electrode of the ninth transistor T9 is configured toreceive the second clock signal CK2, a second electrode of the ninthtransistor T9 is electrically connected to a first electrode of thethird capacitor C3, and a second electrode of the third capacitor C3 iselectrically connected to the first node N1.

For example, when the first node N1 is at a low level, the ninthtransistor T9 is turned on. At this time, if the second clock signal CK2changes from a high level to a low level, that is, the first electrodeof the third capacitor C3 changes from a high level to a low level, thenaccording to the characteristics of the capacitor itself (the differencebetween two electrodes of the capacitor will not change abruptly), thechange of the level of the first electrode of the third capacitor C3adjusts, by coupling, the level of the second electrode of the thirdcapacitor C3 through the third capacitor C3, thereby reducing the levelof the second electrode (that is, the first node N1) of the thirdcapacitor C3.

In the shift register unit 100 provided by the embodiments of thepresent disclosure, by proving the ninth transistor T9 and the thirdcapacitor C3, when the first node N1 is at a low level, the level of thefirst node N1 can be further adjusted by coupling; thus the level of thefirst node N1 is further reduced based on the original low level, so theeighth transistor T8 is turned on more sufficiently (that is, thedriving reset capability of the output reset circuit 160 is improved),the eighth transistor T8 provides the second low voltage VGL2 with a lowlevel to the output terminal OUT without a threshold loss, and theoutput terminal OUT outputs a low level without a threshold loss when itis not necessary to output a high level, thereby improving the contrastof the display panel, and improving the display effect of the displaypanel.

It should be noted that, for other parts in FIG. 7 , reference may bemade to corresponding descriptions in the embodiment as shown in FIG. 6, and details are not described herein again.

In some embodiments of the present disclosure, the shift register unit100 as shown in FIG. 5 may be implemented as the circuit structure asshown in FIG. 8 . It should be noted that the transistors as shown inFIG. 8 are all described by taking P-type transistors as an example. Theactive level of a P-type transistor is a low level, and the inactivelevel of the P-type transistor is a high level.

As shown in FIG. 8 , the first electrode of the third transistor T3 isconfigured to receive the first voltage VGL, the first electrode of theeighth transistor T8 is configured to receive the first voltage VGL, thefirst electrode of the sixth transistor T6 is configured to receive thesecond voltage VGH, and the first electrode of the seventh transistor T7is configured to receive the second voltage VGH. It should be notedthat, for other parts in FIG. 8 , reference may be made to correspondingdescriptions in the embodiments as shown in FIG. 6 and FIG. 7 , anddetails are not described herein again.

Some embodiments of the present disclosure further provide a shiftregister unit 100, as shown in FIG. 9 , unlike the shift register unitprovided in other embodiments, the transistors in the shift registerunit as shown in FIG. 9 all adopt N-type transistors. Only differentparts of the shift register unit as shown in FIG. 9 and the shiftregister unit as shown in FIG. 8 will be described below.

As shown in FIG. 9 , the first electrode of the third transistor T3 isconfigured to receive the second voltage VGH, the first electrode of theeighth transistor T8 is configured to receive the second voltage VGH,the first electrode of the sixth transistor T6 is configured to receivethe first voltage VGL, and the first electrode of the seventh transistorT7 is configured to receive the first voltage VGL. It should be notedthat, in the embodiment as shown in FIG. 9 , the third transistor T3 andthe eighth transistor T8 may also be configured to receive differenthigh-level voltages, for example, one of them receives the first highvoltage VGH1 and the other receives the second high voltage VGH2. Thesixth transistor T6 and the seventh transistor T7 may also be configuredto receive different low-level voltages, for example, one of themreceives the first low voltage VGL1 and the other receives the secondlow voltage VGL2.

It should be noted that the transistors in the embodiments of thepresent disclosure may adopt thin film transistors, field-effecttransistors or other switching devices with the requiredcharacteristics. In the embodiments of the present disclosure, thin filmtransistors are adopted as an example for description. Source electrodesand drain electrodes of the transistors adopted herein can besymmetrical in structure, so the source electrodes and drain electrodesare not different in structure. In the embodiment of the presentdisclosure, in order to distinguish between the two electrodes of atransistor other than a gate electrode, it is directly described thatone of the two electrodes is a first electrode and the other electrodeis a second electrode.

The working principle of the shift register unit 100 as shown in FIG. 8will be described below with reference to the signal timing diagram asshown in FIG. 10 . It should be noted that the level values of signalsas shown in FIG. 10 are schematic and do not represent true levelvalues. In a preliminary stage P1, a pull-up stage P2, a high-potentialmaintenance stage P3, a pull-down stage P4, and a low-potentialmaintenance stage P5 as shown in FIG. 10 , the shift register unit 100as shown in FIG. 8 performs the following operations.

In the preliminary stage P1, the second clock signal CK2 changes from alow level to a high level. Because the first node N1 is at a low levelbefore the preliminary stage P1, the ninth transistor T9 is turned on,and the change of the level value of the second clock signal CK2 iscoupled to the first node N1 through the third capacitor C3, so thelevel of the first node N1 will increase by a small amount at thebeginning of the preliminary stage P1. Then the input signal IN changesfrom a low level to a high level, the first clock signal CK1 changesfrom a high level to a low level, and the first transistor T1 is turnedon by the first clock signal CK1 with a low level, so the input signalIN with a high level is transmitted to the first node N1, and the levelof the first node N1 is further pulled up to a high level.

In addition, the third transistor T3 is turned on by the first clocksignal CK1 with a low level, and the third transistor T3 transmits thelow-level first voltage VGL to the second node N2. Because the P-typetransistor T3 has a threshold loss when transmitting the first voltageVGL, the level of the second node N2 is pulled down to V_(GL)+|Vth|,V_(GL) represents the level value of the first voltage VGL, and Vthrepresents the threshold voltage of the third transistor T3. The fourthtransistor T4 is turned on by the low level of the second node N2, andthe fourth transistor T4 transmits the second clock signal CK2 with ahigh level to the fourth node N4. For example, the high level of thesecond clock signal CK2 is V_(GH), so the potential difference betweenthe two electrodes of the first capacitor C1 is V_(GH)−V_(GL)−|Vth|. Ina last period of the preliminary stage P1, the first clock signal CK1 ischanged from a low level to a high level, so the first transistor T1 andthe third transistor T3 are turned off.

In the pull-up stage P2, the second clock signal CK2 is changed from ahigh level to a low level, and the first clock signal CK1 is at a highlevel. Due to the storage effect of the first capacitor C1, the fourthtransistor T4 remains on, so the level of the fourth node N4 will bepulled down by the low-level second clock signal CK2. Because thepotential difference between the two electrodes of the first capacitorC1 cannot be abruptly changed, compared with the preliminary stage P1,the level of the second node N2 in the pull-up stage P2 is pulled down,by coupling, to a lower level, so the fourth transistors T4 is turned onmore sufficiently. In addition, the fifth transistor T5 is turned on bythe low-level second clock signal CK2, so the low-level second clocksignal CK2 pulls down the level of the third node N3, and the seventhtransistor T7 is turned on by the low level of the third node N3,thereby the seventh transistor T7 outputs the second voltage VGH with ahigh level to the output terminal OUT, that is, the level of the outputterminal OUT is pulled up to the second voltage VGH.

In the high-potential maintenance stage P3, because the second node N2is kept at a low level, the fourth transistor T4 remains on. When thesecond clock signal CK2 changes, this change is transmitted to thesecond node N2 by the coupling effect of the first capacitor C1, so inthe high-potential maintenance stage P3, the level of the second node N2changes with the change of the second clock signal CK2. For example,when the second clock signal CK2 changes from a low level to a highlevel, the level of the second node N2 increases. When the second clocksignal CK2 changes from a high level to a low level, the level of thesecond node N2 decreases.

In addition, in the high-potential maintenance stage P3, when the firstclock signal CK1 is at a low level, the input signal IN remains at ahigh level. At this time, the first transistor T1 is turned on by thelow level of the first clock signal CK1, so the first node N1 remains ata high level. It should be noted that in the stage P3, as long as theinput signal IN remains high when the first clock signal CK1 is at a lowlevel, the first node N1 will remain at a high level and the eighthtransistor T8 remains the state of being turned off, so the outputterminal OUT remains at a high level without being pulled down. Inaddition, it should be noted that before the pull-down stage P4, theinput signal IN is changed from a high level to a low level.

In the pull-down stage P4, when the first clock signal CK1 changes froma high level to a low level, the input signal IN is at a low level, thefirst transistor T1 is turned on, and the input signal IN with a lowlevel is transmitted to the first node N1, so the level of the firstnode N1 drops to a low level. The eighth transistor T8 is turned on bythe low level of the first node N1, so the output signal output from theoutput terminal OUT is pulled down by the first voltage VGL with a lowlevel. In addition, the sixth transistor T6 is also turned on by the lowlevel of the first node N1, so the level of the third node N3 is pulledup by the second voltage VGH with a high level, and the seventhtransistor T7 is turned off.

In addition, in the pull-down stage P4, the ninth transistor T9 isturned on by the low level of the first node N1. When the second clocksignal CK2 changes from a high level to a low level, the coupling effectof the third capacitor C3 causes the level of the first node N1 to befurther pulled down on the basis of a low level, so the eighthtransistor T8 is turned on more sufficiently. The eighth transistor T8provides the first voltage VGL with a low level to the output terminalOUT without a threshold loss, so the output terminal OUT outputs a lowlevel without a threshold loss when it is not necessary to output a highlevel, thereby improving the contrast of the display panel, andimproving the display effect of the display panel.

In the low-potential maintenance stage P5, the input signal IN ismaintained at a low level, the first node N1 is maintained at a lowlevel, and the third node N3 is maintained at a high level, so theoutput signal output from the output terminal OUT may be well maintainedat a low level.

Also in the low-potential maintenance stage P5, due to the effect of theninth transistor T9 and the third capacitor C3, the level of the firstnode N1 will change with the change of the second clock signal CK2. Forexample, when the second clock signal CK2 changes from a low level to ahigh level, the level of the first node N1 is pulled up slightly (stillremains at a low level), and when the second clock signal CK2 changesfrom a high level to low level, the level of the first node N1 is pulleddown to a low level.

In addition, in the pull-down stage P4 and the low-potential maintenancestage P5, the second transistor T2 is also turned on by the low level ofthe first node N1, so the first clock signal CK1 is transmitted to thesecond node N2, and the level of the second node N2 will change with thechange of the first clock signal CK1. For example, when the first clocksignal CK1 changes from a low level to a high level, the level of thesecond node N2 is pulled up to a high level, and when the first clocksignal CK1 changes from a high level to a low level, the level of thesecond node N2 is pulled down to a low level.

In the shift register unit provided by some embodiments of the presentdisclosure, by providing the second transistor T2 such that in thepull-down stage P4 and the low-potential maintenance stage P5, thefourth transistor T4 can remain the state of being turned off when thesecond clock signal CK2 is at a low level, so the low-level second clocksignal CK2 is prevented from being transmitted to the third node N3,which can prevent the level of the third node N3 from being pulled down,and thus prevent the seventh transistor T7 from being turned on to causean abnormal output at the output terminal OUT.

In the shift register unit provided by some embodiments of the presentdisclosure, the level of the third node N3 may be well controlled byproviding the first control circuit 140. The first control circuit 140includes, for example, the fourth transistor T4, the fifth transistorT5, and the first capacitor C1. The first control circuit 140 canimplement the function of controlling the level of the third node N3 byusing the two transistors and the one capacitor, so the circuitstructure of the shift register unit can be simplified, and the numberof transistors can be saved. For example, when the output terminal OUTof the shift register unit needs to provide the output signal, the levelof the third node N3 needs to be maintained at a low level and cannot bepulled up. In this way, the seventh transistor T7 can be turned on moresufficiently, thereby ensuring that the output terminal OUT can normallyprovide the output signal. And in the high-potential maintenance stageP3, even when the fourth transistor T4 is turned on, and when the secondclock signal CK2 is at a high level, because the fifth transistor T5 isturned off by the high level of the second clock signal CK2, the highlevel of the second clock signal CK2 cannot affect the third node N3through the fourth transistor T4 and the fifth transistor T5, so thethird node N3 can be maintained at a low level.

For example, as shown in FIG. 10 , the duty cycle of the first clocksignal CK1 and the duty cycle of the second clock signal CK2 are bothgreater than 50%. In this way, the first clock signal CK1 and the secondclock signal CK2 cannot be at a low level at the same time, so theoutput abnormality of the shift register unit can be avoided. Forexample, when the first clock signal CK1 and the second clock signal CK2are both at a low level, the first transistor T1 and the thirdtransistor T3 are turned on, the second node N2 is pulled down to a lowlevel, the fourth transistor T4 is turned on, and in addition, the fifthtransistor T5 is turned on by the low level of the second clock signalCK2, so the third node N3 is pulled down to a low level, and the seventhtransistor is turned on. If the input signal IN is at a low level atthis time, the first node N1 is pulled down to a low level, so theeighth transistor T8 is turned on. When the seventh transistor T7 andthe eighth transistor T8 are turned on simultaneously, the output signaloutput from the output terminal OUT cannot be determined, that is, anoutput abnormality occurs.

In some embodiments of the present disclosure, the pulse width of theoutput signal output from the output terminal OUT can be adjusted byadjusting the pulse width of the input signal IN. For example, in someembodiments, as shown in FIG. 10 , the duty cycle of the first clocksignal CK1 and the duty cycle of the second clock signal CK2 are bothgreater than 50%, and the periods of the first clock signal CK1 and thesecond clock signal CK2 are the same. For example, as shown in FIG. 10 ,the periods of the first clock signal CK1 and the second clock signalCK2 are both the sum of the durations of the preliminary stage P1 andthe pull-up stage P2.

For example, as shown in FIG. 10 , the pulse width of the output signaloutput from the output terminal OUT is the sum of the durations of thepull-up stage P2 and the high-potential maintenance stage P3. Forexample, in the high-potential maintenance stage P3, in the case wherethe pulse width of the output signal needs to be increased, the highlevel of the input signal IN can be maintained to a time point, in anext period of the first clock signal CK1, when the first clock signalCK1 is at a high level, and in this way, the pulse width of the outputsignal can be extended by one period of the first clock signal CK1. Forexample, in the case where the output terminal OUT needs to output a lowlevel, the input signal IN is adjusted to a low level. When the firstclock signal CK1 becomes a low level in the subsequent timing, theoutput signal output from the output terminal OUT is pulled down to alow level to adjust the pulse width of the output signal.

Some embodiments of the present disclosure further provide a drivingcircuit 10. As shown in FIG. 11 , the driving circuit 10 includes aplurality of cascaded shift register units 100, for example, the shiftregister unit 100 may adopt any one of the shift register units providedin the above embodiments. The driving circuit 10 may be directlyintegrated on the array substrate of the display device by using theprocesses similar to those for forming a thin film transistor. It shouldbe noted that the shift register unit 100 in FIG. 11 is illustrated byusing the shift register unit as shown in FIG. 8 as an example.

For example, as shown in FIG. 11 , except the first-stage of the shiftregister units, any one of the shift register units of other stages isconnected with the output terminal of a shift register unit of apreceding stage before the any one of the shift register units of otherstages, so the output signal of the shift register unit of the precedingstage is used as the input signal IN of the present-stage of the shiftregister units. For example, the first-stage of the shift register unitsmay be configured to receive a trigger signal STV and use the triggersignal STV as the input signal IN.

For example, the driving circuit 10 provided by some embodiments of thepresent disclosure may be used to drive the pixel circuits in pixelunits in a display panel, for example, which can be referred to thepixel circuit as shown in FIG. 1 , but the embodiments of the presentdisclosure are not limited thereto. For example, each pixel circuitincludes a light-emitting control transistor, and control terminals (forexample, gate electrodes) of the light-emitting control transistors inthe pixel circuits in a same row of pixel units are electricallyconnected to a same light-emitting control line. As shown in FIG. 11 ,the output terminal OUT of the first-stage of the shift register unitsis electrically connected to a light-emitting control line CL<1> for thefirst row of pixel units, the output terminal OUT of the second-stage ofthe shift register units is electrically connected to a light-emittingcontrol line CL<2> for the second row of pixel units, the outputterminal OUT of the (N−1)th-stage of the shift register units iselectrically connected to a light-emitting control line CL<N−1> for the(N−1)th row of pixel units, and the output terminal OUT of the(N)th-stage of the shift register units is electrically connected to alight-emitting control line CL<N> for the (N)th row of pixel units. Theoutput signals of the shift register units 100 in the driving circuit 10are transmitted to the control terminals of the light-emitting controltransistors in the pixel circuits through the light-emitting controllines, thereby controlling the light-emitting control transistors. Forexample, the time during which the light-emitting control transistor isturned on can be controlled by adjusting the pulse width of the outputsignal of the shift register unit, thereby controlling thelight-emitting brightness of the corresponding pixel unit.

It should be noted that the driving circuit provided by the embodimentof the present disclosure is not limited to drive the pixel circuit inthe display panel, and can further be used in any other scene thatrequires a control signal, and the method provided by the embodiments ofthe present disclosure can further adjust the pulse width of the controlsignal to meet various requirements.

For example, as shown in FIG. 11 , the driving circuit 10 furtherincludes a first clock signal line CLK1 and a second clock signal lineCLK2. For example, the first clock signal line CLK1 and the second clocksignal line CLK2 are electrically connected to a timing controller(T-con), respectively. For example, the (2n−1)th-stage of the shiftregister units is electrically connected to the first clock signal lineCLK1 to receive the first clock signal CK1, and the (2n−1)th-stage ofthe shift register units is electrically connected to the second clocksignal line CLK2 to receive the second clock signal CK2; and the(2n)th-stage of the shift register units is electrically connected tothe second clock signal line CLK2 to receive the first clock signal CK1,and the (2n)th-stage of the shift register units is electricallyconnected to the first clock signal line CLK1 to receive the secondclock signal CK2. Here n is an integer greater than zero.

For example, as shown in FIG. 11 , the driving circuit 10 furtherincludes a first voltage signal line VL1 and a second voltage signalline VL2, and the first voltage signal line VL1 and the second voltagesignal line VL2 are respectively electrically connected to a powermanagement circuit to receive the first voltage VGL and the secondvoltage VGH respectively. For example, the first voltage signal line VL1is electrically connected to each stage of the shift register units toprovide the first voltage VGL; and the second voltage signal line VL2 iselectrically connected to each stage of the shift register units toprovide the second voltage VGH. It should be noted that, in differentexamples, according to different configurations, more voltage signallines may be used to provide more voltage signals. For example, in thecase where the shift register units 100 in the driving circuit 10 areconfigured to receive the first low voltage VGL1, the second low voltageVGL2, the first high voltage VGH1, and the second high voltage VGH2,four voltage signal lines need to be provided to provide four voltagesignals.

The technical effects of the driving circuit 10 provided in theembodiments of the present disclosure can refer to the correspondingdescriptions of the shift register units 100 in the embodiments of thepresent disclosure, and details are not described here again.

At least one embodiment of the present disclosure further provides adisplay device 1, as shown in FIG. 12 , the display device 1 includesany one of the driving circuits 10 provided by the embodiments of thepresent disclosure.

In some embodiments, as shown in FIG. 12 , the display device 1 mayfurther include a plurality of pixel units 20 arranged in an array, theplurality of pixel units 20 form a pixel array, and each of theplurality of pixel units 20 includes a pixel circuit, for example, thepixel circuit as shown in FIG. 1 . As shown in FIG. 1 , in an example,the pixel circuit includes a data writing sub-circuit 11, a drivingsub-circuit 12, and a light-emitting control sub-circuit 13. Forexample, the output terminal of the (n)th-stage of the shift registerunits in the driving circuit 10 is electrically connected to the controlterminals of the light-emitting control sub-circuits in the pixelcircuits in the (n)th row of the pixel units, and n is an integergreater than zero. For example, the display device 1 further includes aplurality of light-emitting control lines CL, and the driving circuit 10is electrically connected to the control terminals (for example, gateelectrodes of the light-emitting control transistors) of thelight-emitting control sub-circuits in the pixel circuits through theplurality of light-emitting control lines CL.

For example, as shown in FIG. 12 , the display device 1 further includesa gate driving circuit 30 and a data driving circuit 40. The gatedriving circuit 30 is used to provide gate scanning signals to the pixelarray. For example, the gate driving circuit 30 is electricallyconnected to rows of pixel units through a plurality of gate lines GL,respectively. The data driving circuit 40 is configured to provide datasignals to the pixel array. For example, the data driving circuit 40 iselectrically connected to columns of pixel units through a plurality ofdata lines DL.

In the embodiment as shown in FIG. 12 , the gate driving circuit 30 andthe driving circuit 10 are provided on different sides of the displaydevice 1, and the embodiments of the present disclosure include but arenot limited thereto. For example, the gate driving circuit 30 and thedriving circuit 10 may also be provided on a same side of the displaydevice 1.

It should be noted that the display device 1 in the present embodimentmay be a liquid crystal panel, a liquid crystal television, a display,an OLED panel, an OLED television, an electronic paper, a mobile phone,a tablet computer, a notebook computer, a digital photo frame, anavigator and other products or members having display function. Thedisplay device 1 further includes other conventional members, such as adisplay panel, which are not limited by the embodiments of the presentdisclosure.

For the technical effects of the display device 1 provided by theembodiments of the present disclosure, reference may be made to thecorresponding descriptions of the shift register unit 100 and thedriving circuit 10 in the above embodiments, and details are notdescribed here again.

At least one embodiment of the present disclosure further provides adriving method that can be used to drive any of the shift register units100 provided in the embodiments of the present disclosure. The drivingmethod includes adjusting the pulse width of the output signal byadjusting the pulse width of the input signal IN.

For example, in the driving method provided by the embodiment of thepresent disclosure, the duty cycle of the first clock signal CK1 and theduty cycle of the second clock signal CK2 are both greater than 50%.

It should be noted that, for the detailed descriptions and technicaleffects of the driving method, reference may be made to the descriptionsof the working principle of the shift register unit 100 in the relatedembodiments of the present disclosure, and details are not describedhere again.

What have been described above are only specific implementations of thepresent disclosure, the protection scope of the present disclosure isnot limited thereto. The protection scope of the present disclosureshould be based on the protection scope of the claims.

What is claimed is:
 1. A shift register unit, comprising a first inputcircuit, a second input circuit, an output circuit, a first controlcircuit, and a second control circuit, wherein the first input circuitis electrically connected to a first node, and is configured to transmitan input signal to the first node under control of a first clock signal;the second input circuit is electrically connected to the first node anda second node, and is configured to control a level of the second nodeunder control of a level of the first node or the first clock signal;the first control circuit is electrically connected to the second nodeand a third node, and is configured to control a level of the third nodeunder control of the level of the second node and a second clock signal;the output circuit is electrically connected to the third node and anoutput terminal, and is configured to output an output signal to theoutput terminal under control of the level of the third node; and thesecond control circuit is electrically connected to the first node andthe third node, and is configured to control the level of the third nodeunder control of the level of the first node, wherein a pulse width ofthe output signal is adjusted by a pulse width of the input signal,wherein the level of the input signal is maintained to a first timepoint, a high level of the output signal starts to jump from a firsthigh level to a first low level in a second time point when the firstclock signal substantially jumps from a second high level to a secondlow level, wherein the input signal jumps from a third high level to athird low level at the first time point, and the first time point isbetween a start time and an end time of the second high level in aperiod of the first clock signal.
 2. The shift register unit accordingto claim 1, wherein the first control circuit comprises a fourthtransistor, a fifth transistor, and a first capacitor; a gate electrodeof the fourth transistor is electrically connected to the second node, afirst electrode of the fourth transistor is configured to receive thesecond clock signal, and a second electrode of the fourth transistor iselectrically connected to a fourth node; a gate electrode of the fifthtransistor is configured to receive the second clock signal, a firstelectrode of the fifth transistor is electrically connected to thefourth node, a second electrode of the fifth transistor is electricallyconnected to the third node; and a first electrode of the firstcapacitor is electrically connected to the second node, and a secondelectrode of the first capacitor is electrically connected to the fourthnode.
 3. The shift register unit according to claim 1, furthercomprising an output reset circuit, wherein the output reset circuit iselectrically connected to the first node and the output terminal, and isconfigured to reset the output terminal under control of the level ofthe first node.
 4. The shift register unit according to claim 3, furthercomprising a third control circuit, wherein the third control circuit iselectrically connected to the first node, and is configured to adjust,by coupling, the level of the first node under control of the level ofthe first node.
 5. The shift register unit according to claim 1, whereinthe first input circuit comprises a first transistor, a gate electrodeof the first transistor is configured to receive the first clock signal,a first electrode of the first transistor is configured to receive theinput signal, and a second electrode of the first transistor iselectrically connected to the first node.
 6. The shift register unitaccording to claim 1, wherein the second input circuit comprises asecond transistor and a third transistor, a gate electrode of the secondtransistor is electrically connected to the first node, a firstelectrode of the second transistor is configured to receive the firstclock signal, and a second electrode of the second transistor iselectrically connected to the second node; and a gate electrode of thethird transistor is configured to receive the first clock signal, afirst electrode of the third transistor is configured to receive a firstsource voltage, and a second electrode of the third transistor iselectrically connected to the second node.
 7. The shift register unitaccording to claim 1, wherein the second control circuit comprises asixth transistor, a gate electrode of the sixth transistor iselectrically connected to the first node, a first electrode of the sixthtransistor is configured to receive a second source voltage, and asecond electrode of the sixth transistor is electrically connected tothe third node.
 8. The shift register unit according to claim 1, whereinthe output circuit comprises a seventh transistor and a secondcapacitor, a gate electrode of the seventh transistor is electricallyconnected to the third node, a first electrode of the seventh transistoris configured to receive a fourth source voltage, and a second electrodeof the seventh transistor is electrically connected to the outputterminal; and a first electrode of the second capacitor is electricallyconnected to the third node, and a second electrode of the secondcapacitor is electrically connected to the first electrode of theseventh transistor.
 9. The shift register unit according to claim 3,wherein the output reset circuit comprises an eighth transistor, a gateelectrode of the eighth transistor is electrically connected to thefirst node, a first electrode of the eighth transistor is configured toreceive a third voltage, and a second electrode of the eighth transistoris electrically connected to the output terminal.
 10. The shift registerunit according to claim 4, wherein the third control circuit comprises aninth transistor and a third capacitor, a gate electrode of the ninthtransistor is electrically connected to the first node, a firstelectrode of the ninth transistor is configured to receive the secondclock signal, a second electrode of the ninth transistor is electricallyconnected to a first electrode of the third capacitor, and a secondelectrode of the third capacitor is electrically connected to the firstnode.
 11. The shift register unit according to claim 2, furthercomprising an output reset circuit, wherein the output reset circuit iselectrically connected to the first node and the output terminal, and isconfigured to reset the output terminal under control of the level ofthe first node.
 12. The shift register unit according to claim 11,further comprising a third control circuit, wherein the third controlcircuit is electrically connected to the first node, and is configuredto adjust, by coupling, the level of the first node under control of thelevel of the first node.
 13. A driving circuit, comprising a pluralityof cascaded shift register units each of which is according to claim 1,wherein except a first-stage of the shift register units, any one of theshift register units of other stages is connected with the outputterminal of a shift register unit of a preceding stage before the anyone of the shift register units of other stages.
 14. The driving circuitaccording to claim 13, further comprising a first clock signal line anda second clock signal line, wherein a (2n−1)th-stage of the shiftregister units is electrically connected to the first clock signal lineto receive the first clock signal, and the (2n−1)th-stage of the shiftregister units is electrically connected to the second clock signal lineto receive the second clock signal; a (2n)th-stage of the shift registerunits is electrically connected to the second clock signal line toreceive the first clock signal, and the (2n)th-stage of the shiftregister units is electrically connected to the first clock signal lineto receive the second clock signal; and n is an integer greater thanzero.
 15. A display device, comprising the driving circuit according toclaim
 13. 16. The display device according to claim 15, furthercomprising a plurality of pixel units arranged in an array, wherein eachof the plurality of pixel units comprises a pixel circuit, the pixelcircuit comprises a data writing sub-circuit, a driving sub-circuit, anda light-emitting control sub-circuit; an output terminal of an(n)th-stage of the shift register units in the driving circuit iselectrically connected to a control terminal of the light-emittingcontrol sub-circuit of the pixel circuit in an (n)th row of the pixelunits; and n is an integer greater than zero.
 17. A driving method ofthe shift register unit according to claim 1, comprising a preliminarystage, a pull-up stage, a high-potential maintenance stage, a pull-downstage, and a low-potential maintenance stage, wherein in the preliminarystage, causing the second clock signal to be changed in level, causingthe input signal to be changed in level, and causing the level of thefirst node to be pulled up; in the pull-up stage, causing the secondclock signal to be changed in level, causing the level of the third nodeto be pulled down, and causing a level of the output signal to be pulledup; in the high-potential maintenance stage, causing the second clocksignal to be changed in level, causing the level of the first node to bemaintained, causing the level of the output signal to be maintained, andadjusting the pulse width of the output signal by adjusting the pulsewidth of the input signal; in the pull-down stage, causing the firstclock signal to be changed in level, causing the level of the first nodeto be pulled down, causing the level of the third node to be pulled up,and causing the level of the output signal to be pulled down; and in thelow-potential maintenance stage, causing the level of the first node tobe maintained, causing the level of the third node to be maintained, andcausing the level of the output signal to be maintained.
 18. The drivingmethod according to claim 17, wherein a duty cycle of the first clocksignal and a duty cycle of the second clock signal are both greater than50%.
 19. A shift register unit, comprising a first input circuit, asecond input circuit, an output circuit, a first control circuit, and asecond control circuit, wherein the first input circuit is electricallyconnected to a first node, and is configured to transmit an input signalto the first node under control of a first clock signal; the secondinput circuit is electrically connected to the first node and a secondnode, and is configured to control a level of the second node undercontrol of a level of the first node or the first clock signal; thefirst control circuit is electrically connected to the second node and athird node, and is configured to control a level of the third node undercontrol of the level of the second node and a second clock signal; theoutput circuit is electrically connected to the third node and an outputterminal, and is configured to output an output signal to the outputterminal under control of the level of the third node; and the secondcontrol circuit is electrically connected to the first node and thethird node, and is configured to control the level of the third nodeunder control of the level of the first node, wherein a pulse width ofthe output signal is adjusted by a pulse width of the input signal,wherein the level of the input signal is maintained to a first timepoint, a high level of the output signal starts to jump from a firsthigh level to a first low level in a second time point, when the firstclock signal substantially jumps from a second high level to a secondlow level, wherein the input signal jumps from a third high level to athird low level at the first time point, and the first time point isbetween a start time and an end time of the second high level in aperiod of the first clock signal, wherein the first control circuitcomprises a fourth transistor, a fifth transistor, and a firstcapacitor; a gate electrode of the fourth transistor is electricallyconnected to the second node, a first electrode of the fourth transistoris configured to receive the second clock signal, and a second electrodeof the fourth transistor is electrically connected to a fourth node; agate electrode of the fifth transistor is configured to receive thesecond clock signal, a first electrode of the fifth transistor iselectrically connected to the fourth node, a second electrode of thefifth transistor is electrically connected to the third node; and afirst electrode of the first capacitor is electrically connected to thesecond node, and a second electrode of the first capacitor iselectrically connected to the fourth node; wherein the first inputcircuit comprises a first transistor, a gate electrode of the firsttransistor is configured to receive the first clock signal, a firstelectrode of the first transistor is configured to receive the inputsignal, and a second electrode of the first transistor is electricallyconnected to the first node; wherein the second input circuit comprisesa second transistor and a third transistor, a gate electrode of thesecond transistor is electrically connected to the first node, a firstelectrode of the second transistor is configured to receive the firstclock signal, and a second electrode of the second transistor iselectrically connected to the second node; and a gate electrode of thethird transistor is configured to receive the first clock signal, afirst electrode of the third transistor is configured to receive a firstsource voltage, and a second electrode of the third transistor iselectrically connected to the second node; wherein the second controlcircuit comprises a sixth transistor, a gate electrode of the sixthtransistor is electrically connected to the first node, a firstelectrode of the sixth transistor is configured to receive a secondsource voltage, and a second electrode of the sixth transistor iselectrically connected to the third node; wherein the output circuitcomprises a seventh transistor and a second capacitor, a gate electrodeof the seventh transistor is electrically connected to the third node, afirst electrode of the seventh transistor is configured to receive afourth source voltage, and a second electrode of the seventh transistoris electrically connected to the output terminal; and a first electrodeof the second capacitor is electrically connected to the third node, anda second electrode of the second capacitor is electrically connected tothe first electrode of the seventh transistor; wherein the output resetcircuit comprises an eighth transistor, a gate electrode of the eighthtransistor is electrically connected to the first node, a firstelectrode of the eighth transistor is configured to receive a thirdvoltage, and a second electrode of the eighth transistor is electricallyconnected to the output terminal; wherein the third control circuitcomprises a ninth transistor and a third capacitor, a gate electrode ofthe ninth transistor is electrically connected to the first node, afirst electrode of the ninth transistor is configured to receive thesecond clock signal, a second electrode of the ninth transistor iselectrically connected to a first electrode of the third capacitor, anda second electrode of the third capacitor is electrically connected tothe first node; wherein the transistors are P-type transistors, activelevel of the P-type transistors are low level, inactive level of theP-type transistors are high level, and the inactive level is higher thanthe active level.